asn.dev

Autonomous system

AS39403 CMCZAWIERCIE-AS

Unclassified RIPE

IPv4 addresses 256 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly PL
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

CMC Poland

Poland · AI-generated

business manufacturing steel corporate

CMCZAWIERCIE-AS is held by CMC Poland Sp. z o.o.

What it's used for

  • The space carries corporate infrastructure for a steel manufacturer, identified by the netname PL-CMC-ZAWIERCIE and registrant CMC Poland Sp. z o.o.
  • The AS announces 256 IPv4 addresses across 1 prefix with 1 observed neighbour, indicating a small, self-contained internal network rather than a transit or access provider
  • Traffic consists of office workers, industrial control systems, and web endpoints for the Zawiercie steel mill operations

Notable

  • The registrant CMC Poland Sp. z o.o. matches the AS holder, confirming direct ownership of the address space
  • The address inventory consists of a single /24 block, which is finely subdivided for internal site segmentation typical of a large industrial facility

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS8374Polkomtel Sp. z o.o.58

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 1 prefixes · 256 addresses IPv6 0 prefixes

CountryNamePrefixes
PLPoland1

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS39403
Registry name
CMCZAWIERCIE-AS
Registrant
NETIA-MNT
Abuse contact
abuse@tktelekom.pl
Registered
2006-02-15
Last changed
2018-09-04
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 1 with no ROA
ROAs
0 authorising AS39403
ASPA
no ASPA record
IRR
100% registered · 1 of 1 announcements
Route objects
1 naming AS39403

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,773 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check